master 5ee43ba0df causing display hangs?

[Yuri D'Elia]

I briefly noticed commit 5ee43ba0dfd96e5d39da556260346bd3c8ff99c1
(identified by bysecting) causes some modes to hang forever during
display (mu4e-view-mode and the underlying gnus-article-mode), with C-g
being ignored.

Looking at the commit itself doesn't make me think of anything wrong, so
I wonder if this could be caused by some customization.

This shouldn't cause an irrecoverable hang though.